Menaphthone; Vitamin K3; β-Methyl-1,4-naphthoquinone; 2-Methyl-1,4-naphthodione; 2-Methyl-1,4-naphthoquinone
|Molar mass||172.18 g·mol−1|
|Appearance||Bright yellow crystals|
|Melting point||105 to 107 °C (221 to 225 °F; 378 to 380 K)|
|Boiling point||304.5 °C (580.1 °F; 577.6 K) @ 760mmHg|
|Flash point||113.8 °C (236.8 °F; 386.9 K)|
LD50 (Median lethal dose)
|0.5 g/kg (oral, mouse)|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Menadione is a synthetic chemical compound sometimes used as a nutritional supplement because of its vitamin K activity. It is an analog of 1,4-naphthoquinone with a methyl group in the 2-position.
It is sometimes called vitamin K3, although derivatives of naphthoquinone are not naturally occurring chemicals and therefore do not qualify as vitamins, and without the side chain in the 2-position they cannot exert all the functions of the K vitamins. Menadione is metabolized by the human body into K2 which uses alkylation to yield menaquinones (MK-n, n=1-13; K2 vitamers), hence is better classified as a provitamin.
It is also known as "menaphthone".
Despite the fact that it can serve as a precursor to various types of vitamin K, menadione is generally not used as a nutritional supplement in economically developed countries. Menadione for human use at pharmaceutical strength is available in some countries with large lower income populations. It is used in the treatment of hypoprothrombinemia outside of the United States.
Large doses of menadione have been reported to cause adverse outcomes including hemolytic anemia due to glucose-6-phosphate dehydrogenase deficiency, neonatal brain or liver damage, or neonatal death in some rare cases. In the United States, menadione supplements are banned by the U.S. Food and Drug Administration because of their potential toxicity in human use.
Low-dose menadione is still used as an inexpensive micronutrient for livestock in many countries. Forms of menadione are also included in some pet foods in developed countries as a source of vitamin K. These doses have yielded no reported cases of toxicity from menadione in livestock or pets.
A menadione topical lotion was recently developed to reduce epidermal growth factor receptor inhibitor-related side effects, by the prevention of skin toxicities that result from inhibition of protein kinases by drugs such as erlotinib (Tarceva) and cetuximab (Erbitux).
- The Merck Index, 11th Edition, 5714
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- "Vitamin K". Retrieved 2009-03-18.
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- R. Perez-Soler, Y. Ling, Y. Zou, S.R. Deitcher (2008). "Local Rescue of Skin Toxicities Secondary to Kinase Inhibitor (KI) Therapy with Topical Menadione". Annals of Oncology. doi:10.1093/annonc/mdn346.
- Tianhong Li and Roman Perez-Soler (2009). "Skin toxicities associated with epidermal growth factor receptor inhibitors". Targeted Oncology 4 (2): 107–119. doi:10.1007/s11523-009-0114-0. PMID 19452131.